mfc 获取显卡信息

void CGetSysInfo::GetDisplayCardInfo(DWORD &dwNum,CString chCardName[])
{
	HKEY keyServ;  
	HKEY keyEnum;  
	HKEY key;  
	HKEY key2;  
	LONG lResult;//LONG型变量－保存函数返回值  

	//查询"SYSTEM\\CurrentControlSet\\Services"下的所有子键保存到keyServ  
	lResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE,TEXT("SYSTEM\\CurrentControlSet\\Services"),0,KEY_READ,&keyServ);  
	if (ERROR_SUCCESS != lResult)  
		return;  


	//查询"SYSTEM\\CurrentControlSet\\Enum"下的所有子键保存到keyEnum  
	lResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE,TEXT("SYSTEM\\CurrentControlSet\\Enum"),0,KEY_READ,&keyEnum);  
	if (ERROR_SUCCESS != lResult)  
		return;  

	int i = 0,count = 0;  
	DWORD size = 0,type = 0;  
	for (;;++i)  
	{  
		Sleep(5);  
		size = 512;  
		TCHAR name[512] = {0};//保存keyServ下各子项的字段名称  

		//逐个枚举keyServ下的各子项字段保存到name中  
		lResult = RegEnumKeyEx(keyServ,i,name,&size,NULL,NULL,NULL,NULL);  

		//要读取的子项不存在，即keyServ的子项全部遍历完时跳出循环  
		if(lResult == ERROR_NO_MORE_ITEMS)  
			break;  

		//打开keyServ的子项字段为name所标识的字段的值保存到key  
		lResult = RegOpenKeyEx(keyServ,name,0,KEY_READ,&key);  
		if (lResult != ERROR_SUCCESS)  
		{  
			RegCloseKey(keyServ);  
			return;  
		}  


		size = 512;  
		//查询key下的字段为Group的子键字段名保存到name  
		lResult = RegQueryValueEx(key,TEXT("Group"),0,&type,(LPBYTE)name,&size);  
		if(lResult == ERROR_FILE_NOT_FOUND)  
		{  
			//?键不存在  
			RegCloseKey(key);  
			continue;  
		};  



		//如果查询到的name不是Video则说明该键不是显卡驱动项  
		if(_tcscmp(TEXT("Video"),name)!=0)  
		{  
			RegCloseKey(key);  
			continue;     //返回for循环  
		};  

		//如果程序继续往下执行的话说明已经查到了有关显卡的信息，所以在下面的代码执行完之后要break第一个for循环，函数返回  
		lResult = RegOpenKeyEx(key,TEXT("Enum"),0,KEY_READ,&key2);  
		RegCloseKey(key);  
		key = key2;  
		size = sizeof(count);  
		lResult = RegQueryValueEx(key,TEXT("Count"),0,&type,(LPBYTE)&count,&size);//查询Count字段（显卡数目）  

		dwNum = count;//保存显卡数目  
		for(int j=0;j <count;++j)  
		{  
			TCHAR sz[512] = {0};  
			TCHAR name[64] = {0};  
			wsprintf(name,TEXT("%d"),j);  
			size = sizeof(sz);  
			lResult  = RegQueryValueEx(key,name,0,&type,(LPBYTE)sz,&size);  


			lResult = RegOpenKeyEx(keyEnum,sz,0,KEY_READ,&key2);  
			if (ERROR_SUCCESS)  
			{  
				RegCloseKey(keyEnum);  
				return;  
			}  


			size = sizeof(sz);  
			lResult = RegQueryValueEx(key2,TEXT("FriendlyName"),0,&type,(LPBYTE)sz,&size);  
			if(lResult == ERROR_FILE_NOT_FOUND)  
			{  
				size = sizeof(sz);  
				lResult = RegQueryValueEx(key2,TEXT("DeviceDesc"),0,&type,(LPBYTE)sz,&size);  
				chCardName[j] = sz;//保存显卡名称  
			};  
			RegCloseKey(key2);  
			key2 = NULL;  
		};  
		RegCloseKey(key);  
		key = NULL;  
		break;  
	}
}